Ages and metallicities of stellar clusters using S-PLUS narrow-band integrated photometry: the Small Magellanic Cloud

G. Fabiano De Souza, P. Westera, F. Almeida-Fernandes, G. Limberg, B. Dias, J. A. Hernandez-Jimenez, F. R. Herpich, L. O. Kerber, E. MacHado-Pereira, H. D. Perottoni, Rafael Guerço, L. Li, L. Sampedro, A. Kanaan, T. Ribeiro, W. Schoenell, C. Mendes De Oliveira

Research output: Contribution to journalArticlepeer-review

Abstract

The Magellanic Clouds are the most massive and closest satellite galaxies of the Milky Way (MW), with stars covering ages from a few Myr up to 13 Gyr. This makes them important for validating integrated light methods to study stellar populations and star formation processes, which can be applied to more distant galaxies. We characterized a set of stellar clusters in the Small Magellanic Cloud (SMC), using the Southern Photometric Local Universe Survey. This is the first age (metallicity) determination for 11 (65) clusters of this sample. Through its seven narrow bands, centred on important spectral features, and five broad bands, we can retrieve detailed information about stellar populations. We obtained ages and metallicities for all stellar clusters using the Bayesian spectral energy distribution fitting code bagpipes. With a sample of clusters in the colour range -0.20 < r - z < +0.35, for which our determined parameters are most reliable, we modeled the age-metallicity relation of SMC. At any given age, the metallicities of SMC clusters are lower than those of both the Gaia Sausage-Enceladus disrupted dwarf galaxy and the MW. In comparison with literature values, differences are Δlog(age) ≈ 0.31 and Δ[Fe/H] ≈ 0.41, which is comparable to low-resolution spectroscopy of individual stars. Finally, we confirm a previously known gradient, with younger clusters in the centre and older ones preferentially located in the outermost regions. On the other hand, we found no evidence of a significant metallicity gradient.

Original languageEnglish
Pages (from-to)1733-1744
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume527
Issue number2
DOIs
Publication statusPublished - 26 Oct 2023

Keywords

  • galaxies: photometry
  • galaxies: star clusters: general
  • Magellanic Clouds

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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